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Calumet, a publicly traded company based in Indianapolis, has spent $30 million on improvements at the plant, and it likely will spend another $50 million, Milam said.

Calumet, which bought the refinery from NuStar Energy LP in January 2013, has struggled with spills in the last few months.

A March spill left 6,500 gallons of jet fuel in a creek by the plant that feeds into the San Antonio River. Calumet crews used absorbent booms and pads to contain the spill, which affected 1.5 miles of the river.

A pedestrian reported a second spill on April 12, and San Antonio River Authority officials said initial reports showed that about 42 gallons leaked into the creek bed and about 30 yards of the river was affected.

The refinery, at 7811 S. Presa St., is close to the Mission Reach, an eight-mile stretch of the river south of Lone Star Boulevard that recently was restored at a cost of more than $270 million.